diff options
Diffstat (limited to 'packages/linux/linux-rp-2.6.24/tosa/0001-pxa2xx-ac97-switch-AC-unit-to-correct-state-before.patch')
| -rw-r--r-- | packages/linux/linux-rp-2.6.24/tosa/0001-pxa2xx-ac97-switch-AC-unit-to-correct-state-before.patch | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/packages/linux/linux-rp-2.6.24/tosa/0001-pxa2xx-ac97-switch-AC-unit-to-correct-state-before.patch b/packages/linux/linux-rp-2.6.24/tosa/0001-pxa2xx-ac97-switch-AC-unit-to-correct-state-before.patch new file mode 100644 index 0000000000..09f0cb946c --- /dev/null +++ b/packages/linux/linux-rp-2.6.24/tosa/0001-pxa2xx-ac97-switch-AC-unit-to-correct-state-before.patch @@ -0,0 +1,56 @@ +From 688df15bb534519e0698cc8e4a4d9234afd32105 Mon Sep 17 00:00:00 2001 +From: Dmitry Baryshkov <dbaryshkov@gmail.com> +Date: Fri, 7 Nov 2008 15:50:39 +0300 +Subject: [PATCH] pxa2xx-ac97: switch AC unit to correct state before probing + +If AC97 unit is in partially enabled state, early request_irq can trigger +IRQ storm or even full hang up. Workaround this by forcibly switching ACLINK off +at the start of the probe. + +Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com> +--- + sound/soc/pxa/pxa2xx-ac97.c | 30 +++++++++++++++++------------- + 1 files changed, 17 insertions(+), 13 deletions(-) + +Index: linux-2.6.24/sound/soc/pxa/pxa2xx-ac97.c +=================================================================== +--- linux-2.6.24.orig/sound/soc/pxa/pxa2xx-ac97.c 2008-01-25 01:58:37.000000000 +0300 ++++ linux-2.6.24/sound/soc/pxa/pxa2xx-ac97.c 2008-11-15 20:02:45.396976363 +0300 +@@ -284,10 +284,6 @@ static int pxa2xx_ac97_probe(struct plat + { + int ret; + +- ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL); +- if (ret < 0) +- goto err; +- + pxa_gpio_mode(GPIO31_SYNC_AC97_MD); + pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD); + pxa_gpio_mode(GPIO28_BITCLK_AC97_MD); +@@ -296,15 +292,23 @@ static int pxa2xx_ac97_probe(struct plat + /* Use GPIO 113 as AC97 Reset on Bulverde */ + pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT); + #endif ++ GCR = GCR_ACLINK_OFF; ++ + pxa_set_cken(CKEN_AC97, 1); ++ ++ ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL); ++ if (ret < 0) ++ goto err; ++ ++ + return 0; + +- err: +- if (CKEN & (1 << CKEN_AC97)) { ++err: ++/* if (CKEN & (1 << CKEN_AC97)) {*/ + GCR |= GCR_ACLINK_OFF; + free_irq(IRQ_AC97, NULL); + pxa_set_cken(CKEN_AC97, 0); +- } ++/* }*/ + return ret; + } + |